Excavation Control System for Bucket Precision
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Solution Overview
Problem
Existing excavation control systems for construction machines often result in excessive excavation of the surface by the rear of the bucket and fail to accurately control the rear surface on ground level, leading to inefficient and inaccurate excavation processes.
Innovation Solution
An excavation control system that includes a working unit with hydraulic cylinders, a prospective speed obtaining part, a relative speed obtaining part, a speed limit selecting part, and a hydraulic cylinder controlling part, which calculates and adjusts the speed of the bucket's cutting edge and rear surface relative to a designed surface to prevent over-excavation and ensure accurate ground level finishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bucket moves along the designed surface to excavate material, then excavation productivity is improved, but the rear surface of the bucket may excessively excavate the surface or fail to control the rear surface on ground level
Solution Approach 1:
The patent divides the bucket into multiple monitoring points (front surface, rear surface, and intermediate points) to independently control and monitor the motion of different sections. This segmentation allows the system to detect when the rear surface approaches the designed surface and adjust the bucket's motion accordingly, preventing over-excavation while maintaining productivity.
Solution Approach 2:
The patent implements a feedback control mechanism where the relative speed between the bucket and the designed surface is continuously calculated and used to adjust the bucket's motion. When the rear surface approaches the designed surface, the system reduces the relative speed or stops the bucket, ensuring precise control of the excavation depth and preventing excessive excavation.
2Manufacturing precision
If the relative speed between the bucket and designed surface is reduced to improve precision, then surface control accuracy is improved, but excavation productivity decreases
Solution Approach 1:
The patent dynamically adjusts the bucket's relative speed based on the real-time position of the monitoring points relative to the designed surface. When the bucket is far from the designed surface, the system allows higher speeds for productivity. When the rear surface approaches the designed surface, the system automatically reduces speed to ensure precision, creating a dynamic balance between productivity and precision throughout the excavation process.
Data Source
AI summary
An excavation control system includes a working unit, hydraulic cylinders, a prospective speed obtaining part, a relative speed obtaining part, a speed limit selecting part and a hydraulic cylinder controlling part. The prospective speed obtaining part obtains first and second prospective speeds depending on first and second intervals between first and second monitoring points of the bucket and a designed surface, respectively. The relative speed obtaining part obtains first and second relative speeds of the first and second monitoring points relative to the designed surface, respectively. The speed limit selecting part selects one of the first and second prospective speeds as a speed limit based on relative relations between the first and second relative speeds and the first and second prospective speeds, respectively. The hydraulic cylinder controlling part limits a relative speed of one of the first and second monitoring points to the speed limit.